Restructuring Activities and Charges - Narrative (Details) $ in Thousands			3 Months Ended		20 Months Ended
	Feb. 21, 2019	Dec. 14, 2015 USD ($) employee	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2020 USD ($)	Feb. 24, 2020 USD ($)	Aug. 10, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, extension period	2 years
Restructuring charges			$ 3,637	$ 3,934
Restructuring Plan, 2018
Restructuring Cost and Reserve [Line Items]
Non-cash settlements / adjustments						$ 500	$ 400
Restructuring charges			3,637		$ 25,600
Restructuring Plan, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 6,700	(36)
Expected number of positions eliminated | employee		100
Employee Severance and Related Benefits | Restructuring Plan, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges			534
Employee Severance and Related Benefits | Restructuring Plan, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 5,600	(36)
Lease and Contract Termination Costs | Restructuring Plan, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges			358
Lease and Contract Termination Costs | Restructuring Plan, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 1,100	0
Compensation Realignment and Other Retention | Restructuring Plan, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 2,399
Minimum | Restructuring Plan, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges, expected cost						35,000	20,000
Minimum | Employee Severance and Related Benefits | Restructuring Plan, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges, expected cost						9,000
Minimum | Lease and Contract Termination Costs | Restructuring Plan, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges, expected cost						8,000
Minimum | Compensation Realignment and Other Retention | Restructuring Plan, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges, expected cost						18,000
Maximum | Restructuring Plan, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges, expected cost						45,000	$ 25,000
Maximum | Employee Severance and Related Benefits | Restructuring Plan, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges, expected cost						12,000
Maximum | Lease and Contract Termination Costs | Restructuring Plan, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges, expected cost						10,000
Maximum | Compensation Realignment and Other Retention | Restructuring Plan, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges, expected cost						$ 23,000